JavaScript学习与实践（21）

JS中的数组对象，他用于使用一个变量名字存储一组值，

例子：这个例子是创建一个数组，并分配了数值，最后打印出其中的值，

<html>
<body>
<script type="text/javascript">
var mycars = new Array()
mycars[0] = "Saab"
mycars[1] = "Volvo"
mycars[2] = "BMW"
for (i=0;i<mycars.length;i++)
{
document.write(mycars[i] + "<br />")
}
</script>
</body>
</html>

下面是一个for...in，怎么用他来循环便利数组中的每个元素呢？

<html>
<body>
<script type="text/javascript">
var x
var mycars = new Array()
mycars[0] = "Saab"
mycars[1] = "Volvo"
mycars[2] = "BMW"
for (x in mycars)
{
document.write(mycars[x] + "<br />")
}
</script>
</body>
</html>

下面是一个连接两个数组的方法concat()

<html>
<body>
<script type="text/javascript">
var arr = new Array(3)
arr[0] = "Jani"
arr[1] = "Tove"
arr[2] = "Hege"
var arr2 = new Array(3)
arr2[0] = "John"
arr2[1] = "Andy"
arr2[2] = "Wendy"
document.write(arr.concat(arr2))
</script>
</body>
</html>

下面是一个join()方法，他是把一个数组中所有的元素方到一个字符串中，，其中可以指定标点符号例子：

<html>
<body>
<script type="text/javascript">
var arr = new Array(3)
arr[0] = "Jani"
arr[1] = "Hege"
arr[2] = "Stale"
document.write(arr.join() + "<br />")
document.write(arr.join("."))
</script>
</body>
</html>

下面一个是分类，区别的sort()，他用于字面的，或者是数字的下面有两个例子来加以区别：

<html>
<body>
<script type="text/javascript">
var arr = new Array(6)
arr[0] = "Jani"
arr[1] = "Hege"
arr[2] = "Stale"
arr[3] = "Kai Jim"
arr[4] = "Borge"
arr[5] = "Tove"
document.write(arr + "<br />")
document.write(arr.sort())
</script>
</body>
</html>

第二个

<html>
<body>
<script type="text/javascript">
function sortNumber(a, b)
{
return a - b
}
var arr = new Array(6)
arr[0] = "10"
arr[1] = "5"
arr[2] = "40"
arr[3] = "25"
arr[4] = "1000"
arr[5] = "1"
document.write(arr + "<br />")
document.write(arr.sort(sortNumber))
</script>
</body>
</html>

上面这个我还没有理解，希望大家，指导我一下，谢谢

Array Object Methods

FF: Firefox, N: Netscape, IE: Internet Explorer

Method	Description	FF	N	IE
concat()	Joins two or more arrays and returns the result	1	4	4
join()	Puts all the elements of an array into a string. The elements are separated by a specified delimiter	1	3	4
pop()	Removes and returns the last element of an array	1	4	5.5
push()	Adds one or more elements to the end of an array and returns the new length	1	4	5.5
reverse()	Reverses the order of the elements in an array	1	3	4
shift()	Removes and returns the first element of an array	1	4	5.5
slice()	Returns selected elements from an existing array	1	4	4
sort()	Sorts the elements of an array	1	3	4
splice()	Removes and adds new elements to an array	1	4	5.5
toSource()	Represents the source code of an object	1	4	-
toString()	Converts an array to a string and returns the result	1	3	4
unshift()	Adds one or more elements to the beginning of an array and returns the new length	1	4	6
valueOf()	Returns the primitive value of an Array object	1	2	4

Array Object Properties

Property	Description	FF	N	IE
constructor	A reference to the function that created the object	1	2	4
index		1	3	4
input		1	3	4
length	Sets or returns the number of elements in an array	1	2	4
prototype	Allows you to add properties and methods to the object	1	2	4

posted @ 2007-01-31 12:04 lxsohu 阅读(365) 评论(1) 收藏举报

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